gefran GPC, Configuration And Programming Manual

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81901A “MSW_GPC-40/600A”_03-2021_ENG_page 135
4. EXAMPLES AND APPLICATION NOTES
4.1. Setting parameters LS.A1/LS.A2/LS.A3 and HS.A1/HS.A2/HS.A3
The default values (LS.A1/LS.A2/LS.A3 = 0.0 and
HS.A1/HS.A2/HS.A3 = 100.0) can be changed to obtain
different assignments between the physical input value (V
or mA) and the engineering value (
In.A1/In.A2/In.A3 ).
In automatic operation the engineering value ( In.A1/In.A2/
In.A3 ) is allocated, for values between 0.0 and 100.0, to
power Ou.P .
4.1.1. Full input voltage range
Initial data
V
IN
= 0...10 V
tyP = 1
In this case the input voltage V
IN
covers the entire range that
the device can control. There is therefore no need to modify
LS.A and HS.A , which can be left at their default values.
4.1.2. Input voltage range limited down-
wards
Initial data
V
IN
= 2...10 V
tyP = 1
In this case, the V
IN
input voltage only covers the upper
80% of the range that the device can control. This range
should therefore be extended downwards so that 80%
of the modified range corresponds to the useful range
(0...100). 80% of 125 corresponds to 100.
Setting
LS.A = -25.0 and HS.A = 100.0 gives the desired
result.
0 0%
2 4 6 8 10
100
50
100%
LS.A = 0.0
HS.A = 100.0
V
IN
Ou.P
0 0%
2 4 6 8 10
100
50
100%
LS.A = -25.0
HS.A = 100.0
V
IN
Ou.P
4.1.3. Input voltage range limited upwards
Initial data
V
IN
= 0...9 V
tyP = 1
In this case the V
IN
input voltage only covers the lower 90%
of the range that the device can control. This range should
therefore be extended upwards so that 90% of the modified
range corresponds to the useful range (0...100). 90% of
111.1 corresponds to 100.
Setting
LS.A = 0.0 and HS.A = 111.1 gives the desired
result.
4.1.4. Formulas for calculating LS.Ax and
HS.Ax
Given the following definitions:
min
d
= lower limit of the range controllable by the input
device
max
d
= upper limit of the range controllable by the input
device
min
in
= real lower limit of the input signal
max
in
= real upper limit of the input signal
we have
LS.Ax = 100
min
d
- min
in
max
in
- min
in
HS.Ax = 100
max
d
- min
in
max
in
- min
in
0 0%
2 4 6 8 10
100
50
100%
LS.A = 0.0
HS.A = 111.1
V
IN
Ou.P